Java动态代理

1 public interface DynamicProxy {
2 
3     String sayHello();
4 
5 }

1 public class DynamicProxyImpl implements DynamicProxy {
2 
3     @Override
4     public String sayHello() {
5         return "Hello World!";
6     }
7 
8 }

 1 public class JdkProxyExample implements InvocationHandler {
 2 
 3     private Object target;
 4 
 5     public Object bind(Object target) {
 6         this.target = target;
 7         return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), this);
 8     }
 9 
10     @Override
11     public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
12         System.out.println("前处理");
13         Object object = method.invoke(this.target, args);
14         System.out.print(object);
15         System.out.println(" 处理中");
16         System.out.println("后处理");
17         return object;
18     }
19 
20 }

1 public class DynamicProxyCaller {
2 
3     public void foo() {
4         JdkProxyExample jdkProxyExample = new JdkProxyExample();
5         DynamicProxy dynamicProxy = (DynamicProxy) jdkProxyExample.bind(new DynamicProxyImpl());
6         System.out.println(dynamicProxy.sayHello());
7     }
8 
9 }